Yes, that is the set up. The strings are held together by a knot if that makes a difference, and I have drawn a fbd of the known forces on the knot. Thank you, I will try it again with the information you have given.
Okay, so I did a lab where we had a 2 pulley system that involved a string and three masses. The string is set up so it is in the shape of an m when put on the pulleys. The known mass is put on the middle string (m3) hanging down and the two outside masses (m1) and (m2) are unknown and are not...